Strange fang shaped pearl

[Quinzel]

My hubby works at a seafood restaurant and will bring home the occasional pearl. They have reached in color and size but have pretty much be pearl shaped or at least recognizable as a pearl. However he brought this, thing, home with him today and I'm not really sure what it is supposed to be, but wanted to share it somewhere. Took a few pictures with a penny next to it for size reference.
http://imgur.com/a/KVrEx52
http://imgur.com/a/xfjzKIA

 

[jshepherd]

That's a natural pearl. It's not very fine, unfortunately. But it's a natural pearl in a wing shape. It's a very rare find.

 

[Quinzel]

Thank you. :3 He's pretty proud of it and wants to make it into a necklace pendant.

 

[Vincee]

I found a fang shaped pearl on the seashore. See image from the link. Is it a real pearl? https://imgur.com/gallery/9lHbZtJ

 

[Pearl Dreams]

That looks to me like a piece of shell that has been worn smooth by the ocean.

 

[jshepherd]

I agree. That one's not a pearl.

 

[parfaitelumiere]

Hi Quinzel, de he also keep the shell?
I hope so.
What shell is it?